The smaller the instrument, the smaller the controls and batteries. So if your eyes are not what they used to be, if you have shaky hands, or if your fingers cannot cope with adjusting small controls, you will find a larger instrument easier to handle. Alternatively, some new instruments adjust automatically or via remote control. Your audiologist will advise you on the most suitable option for you.
Binaural or Monaural
Two ears are always better than one. If you have hearing loss in both ears, you need to consider wearing two devices. Not because they make things twice as loud, but because, by mimicking the natural hearing process they help you determine where the sounds are coming from, and to distinguish between competing sounds more easily. This makes it easier to understand what people are saying in noisy situations.
Binaural models give you improved overall sound quality, balanced hearing and listening ease. On the other hand, if you wear just one device, the un-amplified ear may lose its ability to hear, analyze and understand speech as a result of auditory deprivation.
Other audiological factors, which influence device selection, are: risk of acoustic feedback (whistling), past history of wax build up in the ear, and the clinical need for ventilation (in patients who are prone or have an ear infection).